Lifeboat davit



Oct. 72 1930.

C, M, OBRlEN ET AL 1,777,980

LIFEBOAT DAVIT Filed Oct. 26, 1929 2 Sheets-Sheet l Oct. 7, 1930. c. M. oBRn-:N ET AL LIFEBOAT DAVIT Filed Oct. 26, 1929 2 Sheets-Sheet 2 dumme-g Patented Oct. 7, i 19230 1;time.Sms-j PATENT: OFFICE fooRNEL'IUs MICHEAL oBRi YAND 's'iEPHEN YJOSEPH BOSTON, MAssAcHusETTs LIFEBOAT' DAVIT V: f Application rled October `26,- 1929. Serial No. 402,699. f

l The present'inventonvrelates to life saving apparatus and more particularlyrto means for lowering lifeboats over the side of a vessel. i Y i 5: An object of thisinvention is to provide al davit which isadapted to Vswing-,the lifeboat away from the side-,ofthe vessel so as 'y v, to vpermit the oarsmen to position the oars in the oar-locks ready-foroperation before 10 the boat comes into contact with/the water.

',Inthe'devicesVatgpresent injuse, the lifelboat is lowered so vclosely alongsidethevessel thatlitis impossible to positionthe oars Y. yparticularlyon the side of the lifeboat imme- 'l 15' ldiately adj acenty theV vessel.

Another object'of thisinventionmisjto provide a davit whereinyonly oneboom is yrequired in place of the two now infuse.A` i v,

A still further object of.y this inventionvis 20.1;oprovde adevice-'of thisoharacter yhaving l Y means secured theretofo'r lSwingingthvezboom`A outwardly from .the side ofthe ship to ,-a

lpointlwhere the lifeboat will fnotv comey into i zcontactfWitlitheside ofthe vessel evenV l' 25, though the vesselv may have a decided list v d whichV would, in presentstructures, ,elimif q, nate Yany possibilityfof successfully ,loweringv ftheflifeboat. i a o Another object of thisyinventionis to pro-V.,y l30 videa deviceof this ,character with lowering,

4means vwhich will .eliminate any possibility v oftangledropes obstructing the lowering" f j thereof,1` the lowering Vmeans, includingl the,V

Akuseofcables,wire rope orthe like-` 'ifrelationto thevessel; c

Figure 2is a,fragmentarysectional viewA @of the boom` showing in detail fthe' c swivel jointfwith ballbearings and'anrorilY retaining Figure Sis afragmentary view in elevation of the lifeboat securing means, and

ritenne, on Len!xmmscrown,

Figure 4 is ai side elevationof a modification of this invention. 1 p n u Referring to the drawings, the., numeral 10, indicates generally the side of a 4vessel on whiohis hingedly mounted Ta boom 11,

the'lower end of the boom 11 being hingedly secured at '12to the side of the vessel in any desirable manner so as to permit the free outward movement of the boom on the hinge 12. Theboom 11 is Ipreferably constructed two sections, the lower portion 18 ofwhich y1s4` secured at itslower end to thel hinge 12 provided with a downwardly extendling openingll in its upper end.

` ,'It'wilhjof course, be understood that the lower member A13 may be constructed of any desired material and, ifdesired, ,a hollow 'g pipe. or 'the like may be used, The upper portion 15 of the boom isadaptedatiits lower end to be rotatably mounted in the *opening :14 of thelower member, l'and in order to Y i Vfacilitate the free'rotationjof the upper portion, a swivel member 16 is provided.

1 1 75 The upper end-of the boom 11 is preferablyM arcuately inclined andV is provided at its upl perend with an opening 17 in which ymay be Vmounted a swivel 18 of yany suitable'cons'truction. yAnidling pulley 20 may be lmounted on the boomll spaced downwardly Vfromthe upper end thereof, the pulley 20 being adapton lthe vessel. The rotary movement of the booin 11 is restricted by stop members 15'* mounted on the lower boom member 13 and stop members 15b 'mounted on the boom l1. f 'Iphe rope 2l is adapted to engage the pulley 19 andis provided at its outer vendiwith a f swivel 23Kand-a shackle 24 engages the swivel 23 being" provided withg-g threaded ,apertures lat its upper end in whichmaybe mounted a pin 4'25 or the like. A pair of slings'or flexiblelinks 26'havingyloops or ueyes 27 at the yoppositejends thereof areadapted vtobe ymounted at their yupper ends on ,said shackle and are provided at theirlowerends with swiveledhooks 28;

, r The ,swiveled'fhooks preferably engage edito carry acable or wire rope21which may i p be secured to awinch 22 or the like, mounted 10o fx in eyes 29 which may be mounted at the opposite end portions of the lifeboat or at anyr lifeboat may be lowered'over the'side of the vessel through the. use of only oneboom.

' Wherethe-water isoalm and it is notriieoes- 'tofa point' where it Vwill :lie substantially "sary for the rew'of the lifeboat to position the oars in the oar-looks before entering'theV water the boom l1 may be held firmly against the side of the vessel, the arcuate upper portion of the boom beingfsuohlthat ample `free-f.V

board isprovided for lowering` the lifeboat against the side ofthe'vesselQ y p In cases, however,'where it is essential to :have the lifeboat lowered a Considerable-:fdistaneeeaway from'A the iside of` the lvessel,the Vboom ll may beswungl outwardly vonfits rhinge'lQ andy ahol'ding rope or other flexible member 8O maybe mounted on-any suitable power wi'nehatv its inner end andsecured at its outer end to a swivel 31 'whieh'lsloos'ely mounted about the upperportion l5 ofthe {bo'om and is held against longitudinal inove- @ment thereon by Collars 32, lor thelile, which aresecured aboutthe periphery ofthe upper portion 145 `and loosely .engaging theoppositeVend-portions vofthe swivel; 'Through "use ofk the l''loweringmeans V'30, the boom 'mayjbe swungoutwardlyfrom thesideof the -vessel onits hinge 12-to a positionfwhere theV f'fusualmanner. j v

/ When'the lifeboat liasbeenloosened from* floweringof thelifeboatby means of theeable or ziiexible f member mayy nproeeed yiny the4r *fthe slings Qfthe'boom may be raised upward- 34? slidably,- mounted therein may engage the lower-,portionlSof-theboom in any suitable "F'V'manner but -in the present embodiment a con- `nec-'ting rod or the 'like' 35V is attached atfone ingVpositifon-.fff s ff-f EIn' Figure 4 'thereI 'off-thejpre'sent inventionwlierein the swing- -ijngi ofthe boom lil vo'utwardlyi's. Vassisted'by airlr'pressuremeans.y In this-modicationan* l 1 `#air-pressure tank 33having an air plunger@ longitudinal movement@offthei-ringland flex- `ibleineans secured to said swiveliringwhereby the booin-may'bels'wung outwardly -ofthe i v v l f i' 1115 ly byreversing themovement ofthe cable lor is shown a mo diiication? #fendito-thefairplunger 34;' y The outer endof the connecting rod l35 f' preferably has a segiiieiit-jasecured thereto,F 'The air plungerf 34'isfadaptedX lto push' the boom over thefcen ter'f ofl l,f gravity "so VasteV faciiitate thef Outward "ijiiovement?thereof;A i Y Lltwl'lff @01112565 be 11 e movement of theair plungerin thefeompres-' i Vi-f'soriis suehyas to effect -therdesiredoutward ",-movement ofthe boom and4 that the segment 35i notattaohed'tothehoom so that when the "boeuf passes the centerfof gravity Vthe'fair plunger may be returnedto-normallpositioni f A#suitable"source'*ofV airpressure supply 36 willthen` be in aseagomay be provided for maintaining the proper' pressure within the compressor.v` Y* F rom the foregoing itv will be seen that the details vof construction may be varied to meet varying circumstances and Where desired, the

boom maybe equipped with both ythe vflexible member y-BOand the hydraulie-member, the

hydraulic member serving Vthe purpose of l pushing the boom zover the, vlCenter off gravity fwhilebeiiig swung outwardly, 7

`Whenthe boom has been swung Vfinboard o `Vthezbeat 37 may rest ony a plurality of* ehocks 38 or the like.v Where facilities arenot avail- 7 able forrmeehanieal'ly raising the boat 37 the'I f inboard ehocks) may be slidably mounted .8O

on' Y the -rdeol'rfand handjoperatingL means v4() K release the yboat 87 and permit the outboard movement thereof. rllhe boom -ll may be s heldin inboard position-byguy ropesf41 01u85 the like,;oneend of theguy ropes 41 being secured tothe declrand the opposite end-removablymounted on a pivoted bar 42fwhioh isinounted on the' upper'endof thelboom 11.

lt will, of course,"be understood that vari-Ew ous `Changes and medieations-'mayVbeinade in: the details of construction yand ldesign Aof the above specifically deseri'bed-embodiment of the inventionwithout Vdepai-tin'glfrom the spirit thereof, suohj'ehanges aandv modifica-95 tions being restricted only by the scope of the ing an enlarged lportion vat a" pointspaoed vup- 'wardly'from the lower end,l`means carried-by v Y Y,theflowerY portion engaging? said enlarged-"2105 Jportion' ofYV the upper portio-nlwhereby to swivelly mount the` upper yportion'on the lower portion, a swivel ring loosellyrmounted about the periphery #of said Aupperriportion, y "said upper boomfjportion beingprovided 1.10

with outstanding collars'whereb to prevent QfjAdavit-of-the characterdeseribed,comz -prising `a hingedboom, said boom' havingfanupper and a lowerv portion, said; upper '.porf tion being' rotatable in sajid lower-portiom i mean-smoi-intreden `said` lower.p'ortionvfbrimn f swivelly mounting said upper' portion there-ff ery'l of saidiufpper- 1portion*spaced-down-V fwardlyfrom lthe" upp'erifenditliereof and?y adapted to #rotate ther'eabc eut,l stop means sei-'i125 s prisring afb'oom-hingedlymountedronfthe side-wo of 'a -`vessel, said-"boom comprising"anv upper and a `lower# portion, said yupper portion havagainst longitudinalmovement, stopi means y f Y' fonsaidlowerportionfandengaging'saidlup- 'perp'ortio-n whereby.- tolimitlthe rotationof' j the upper'portion, and flexible; nlieansfiffo 130".

raising and lowering the boom on its hinge.l 1y

3; A davit comprisingv a boom hinge vmounted on a vessel, said boom having an upper and a'lower portion, said upper portion being adapted to rotate on said lower portion, means yfor limiting the rotation of the upperportion on the lower portion, saidy Y means comprising a lug mounted on the v'lower portion and an outstanding pin on the upper portion mounted in the path of said lug,.said upper portion being arcuately in- K, olined, aswiveled pulley mounted on the upperv end of said boom, a pivoted pulley mounted on the boom spaced downwardly y, from the upper end thereof, a flexible member adapted to-travelfin said pivoted pulley,

land .said swiveledpulley, and ,lifeboat seourin means mounted at the outer end of said eXible member.

" 4. A' davit of the character described comprising a boom hingedly mounted on the side y of avessel, said boom vcomprising an upper and a lower portion, saidy upper portion havv ing an enlarged portionv at a' point spaced upwardly from the lower end, means "carried by the lower portion engaging said enlarged Vportion rof the upper' portion `whereby to swivelly ymount the upper portion on the lower portion, a swivel ring loosely mountedabout the periphery of the upper portion,

Vsaid upper boomV portion being provided with outstanding collars whereby to prevent longitudinal movement of the ring, flexible lowering means secured tothe yswivel ring,

e and 'hydraulic` means engaging the' boom whereby tofforce the boom past the'center ,y Yof gravityV and outwardly ofthe vessel.'

ln testimonyv whereofwe hereunto aix our signatures.

CORNELIUS -MIGHEAL OBRIEN.

V STEPHEN JOSEPH PILCHER.` 

